add plugin-survey-grid

[szorowi1]

The survey-grid plugin is an extension of the native survey-likert plugin. Experimenters specify a series of questions, which are displayed to participants on a grid. Participants select their responses to each item on the grid using radio buttons. On the front-end, the plugin involves some light CSS that makes filling out the questions easier (e.g., repeating scale labels, highlighted questions on hover).

On the back-end, the plugin provides multiple methods for detecting careless/insufficient effort (C/IE) responding. These include:

• Recording the target and timing of every radio button event. This can be used to detect suspiciously fast and/or large numbers of events, which may indicate bots or script users.
• Honeypot questions, or questions that are hidden from participants but "visible" to bots. Responses to these items are indicative of bots or script users.
• Records page time, or the time from when the questions first appear on the screen until the participant's response(s) are submitted. Unusually fast page times may indicate low-quality responses.
• Scoring participants' responses for "straightlining" and "zigzagging", two forms of C/IE responding. Scores closer to 1 on either metric may indicate low-quality responses.

The plugin also includes several quality-of-life features that may be useful for experimenters collecting self-report data, including reverse-scoring of items and the option to score the lowest response anchor as either zero or one.

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Latest commit: bd7fc22

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[DominiqueMakowski]

Looking forward to this!